Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a5f098c04ac8c1…

MALICIOUS

PDF

83.3 KB Created: 2021-04-09 08:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 631ac4829a2137de1bfb0eab62e7a923 SHA-1: 828c7e54082f5f1dde8c1d79711ba75d23d8dbae SHA-256: b0a5f098c04ac8c188b91ebf9be2613b5009c73c132791057ad63aec8c29072d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/strik?utm_term=how+to+write+epsilon+symbol+in+latex PDF link annotation
    • https://tolajugim.weebly.com/uploads/1/3/4/6/134647220/tanimewum_lozale_tipaxonilixoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498834/normal_60453a0562df9.pdfIn PDF document text
    • https://xofoxinef.weebly.com/uploads/1/3/0/8/130874051/moropojad.pdfIn PDF document text
    • https://wekexobesunolo.weebly.com/uploads/1/3/0/7/130739288/887596.pdfIn PDF document text
    • http://fufejezonodim.mywebcommunity.org/juvodovized.pdfIn PDF document text
    • https://koduxiwarutuj.weebly.com/uploads/1/3/2/7/132740502/waremuvulebaxododum.pdfIn PDF document text
    • http://movizopolu.medianewsonline.com/fesiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483837/normal_604675a0671d9.pdfIn PDF document text
    • https://kenufipafalenar.weebly.com/uploads/1/3/4/6/134616414/gogematumote_pibax_pekelaxafadus_goporevumid.pdfIn PDF document text
    • http://dowotezovemalo.mygamesonline.org/amanda_knox_book.pdfIn PDF document text
    • http://rezokivi.medianewsonline.com/40336888118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454982/normal_605b91067bc78.pdfIn PDF document text
    • http://nuwetiveguvo.mypressonline.com/american_gods_cast_leprechaun.pdfIn PDF document text
    • https://fumabufoduf.weebly.com/uploads/1/3/5/3/135313851/rijimire_suzisolasuju_kuranopa_poxova.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374366/normal_5ff0d90319ebc.pdfIn PDF document text
    • http://xebubux.sportsontheweb.net/thrive_arianna_huffington.pdfIn PDF document text
    • https://penizamuravepu.weebly.com/uploads/1/3/5/9/135976181/folabetowekisoma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/lofeguzafarajosibefize.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/vumezajomowevuxeluluz.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/how_much_does_a_forklift_license_cost_uk.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/chuyn_hnh_nh_sang_trc_tuyn.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/how_do_you_use_loreal_hicolor_blonde_for_dark_hair.pdfIn PDF document text
    • http://xedavabawavela.onlinewebshop.net/bring_up_genius_laszlo_polgar_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/22659361898.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 5328 bytes
SHA-256: 11f1ad5009bcbfb2544e7957bfbf694fb70bc06882d8352fe73491c4ddd1dfcb
font_01_sfnt_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 17224 bytes
SHA-256: b7d251c86c5c01157310a3cb21b857617cc02c5da596921c38c16ec2555c84d6
font_02_sfnt_off00012ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC0 16080 bytes
SHA-256: 43edd991dd82ac0fa2eca9b739274f2e51255dde0463e5ab0a893647ae73f153